<template>
  <view v-if="goods_info.goods_name" class="goods-detail-container">
    <!-- 轮播图区域 -->
    <swiper :indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000" :circular="true">
      <swiper-item v-for="(item, i) in goods_info.pics" :key="i">
        <image :src="item.pics_big" @click="preview(i)"></image>
      </swiper-item>
    </swiper>

    <!-- 商品信息区域 -->
    <view class="goods-info-box">
      <!-- 商品价格 -->
      <view class="price">
        ￥{{goods_info.goods_price}}
      </view>
      <!-- 商品信息主体区域 -->
      <view class="goods-info-body">
        <!-- 商品的名字 -->
        <view class="goods-name">
          {{goods_info.goods_name}}
        </view>
        <!-- 收藏 -->
        <view class="favi">
          <uni-icons type="star" size="18" color="gray"></uni-icons>
          <text>收藏</text>
        </view>
      </view>
      <!-- 运费 -->
      <view class="yf">
        快递:免运费
      </view>
    </view>

    <rich-text :nodes="goods_info.goods_introduce"></rich-text>

    <!-- 商品导航组件 -->
    <!-- 商品导航组件区域 -->
    <view class="goods_nav">
      <uni-goods-nav :fill="true" :options="options" :buttonGroup="buttonGroup" @click="onClick"
        @buttonClick="buttonClick" />
    </view>
  </view>
</template>

<script>
  // 按需导入
  import {
    mapState,
    mapMutations,
    mapGetters,
  } from 'vuex'


  export default {
    computed: {
      ...mapState('m_cart', []),
      ...mapGetters('m_cart', ['total'])
    },

    watch: {
      total: {
        handler(newVal) {
          // 监听 total 值的变化，通过第一个形参得到变化后的新值
          // 通过数组的 find() 方法，找到购物车按钮的配置对象
          const findResult = this.options.find(x => x.text === '购物车')

          if (findResult) {
            // 动态为购物车按钮的 info 属性赋值
            findResult.info = newVal
          }
        },
        immediate: true
      }
    },

    data() {
      return {
        // 商品详情对象
        goods_info: {},
        // 左侧按钮组的配置对象
        options: [{
          icon: 'shop',
          text: '店铺'
        }, {
          icon: 'cart',
          text: '购物车',
          info: 0,
          // 右侧按钮组的配置对象
          // buttonGroup: [{
          //     text: '加入购物车',
          //     backgroundColor: '#ff0000',
          //     color: '#fff'
          //   },
          //   {
          //     text: '立即购买',
          //     backgroundColor: '#ffa200',
          //     color: '#fff'
          //   }
          // ]

        }],

        // 右侧按钮组的配置对象
        buttonGroup: [{
            text: '加入购物车',
            backgroundColor: '#ff0000',
            color: '#fff'
          },
          {
            text: '立即购买',
            backgroundColor: '#ffa200',
            color: '#fff'
          }
        ]

      }
    },
    methods: {
      ...mapMutations('m_cart', ['addToCart']),

      async getGoodsDetail(goods_id) {
        const {
          data: res
        } =
        await uni.$http.get('/api/public/v1/goods/detail', {
          goods_id
        })
        if (res.meta.status !== 200) return uni.$showMsg()

        // 使用字符串的 replace() 方法，将 webp 的后缀名替换为 jpg 的后缀名
        res.message.goods_introduce = res.message.goods_introduce.replace(/<img/g, '<img style="display:block;" ')
          .replace(/webp/g, 'jpg')

        this.goods_info = res.message
      },

      // 实现轮播图的预览效果
      preview(i) {
        // 调用 uni.previewImage() 方法预览图片
        uni.previewImage({
          // 预览时，默认显示图片的索引
          current: i,
          // 所有图片 url 地址的数组
          urls: this.goods_info.pics.map(x => x.pics_big)
        })
      },

      onClick(e) {
        console.log(e)
        if (e.content.text === '购物车')
          uni.switchTab({
            url: '/pages/cart/cart'
          })
      },

      buttonClick(e) {
        console.log(e)
        if (e.content.text === '加入购物车' || '立即购买') {
          // 组织商品的信息对象
          // { goods_id, goods_name, goods_price, goods_count,goods_small_logo,goods_state}
          const goods = {
            goods_id: this.goods_info.goods_id,
            goods_name: this.goods_info.goods_name,
            goods_price: this.goods_info.goods_price,
            goods_count: 1,
            goods_small_logo: this.goods_info.goods_small_logo,
            goods_state: true
          }
          //调用 addToCart 方法
          this.addToCart(goods)
        }
      },


    },

    onLoad(options) {
      console.log(options)
      const goods_id = options.goods_id
      this.getGoodsDetail(goods_id)
    },

  }
</script>

<style lang="scss">
  swiper {
    height: 750rpx;

    image {
      width: 100%;
      height: 100%;
    }
  }

  .goods-info-box {
    padding: 10px;
    padding-right: 0;

    .price {
      color: #C00000;
      font-size: 18px;
      margin: 10px 0;
    }

    .goods-info-body {
      display: flex;
      justify-content: space-between;

      .goods-name {
        font-size: 13px;
        margin-right: 10px;
      }

      .favi {
        width: 120px;
        font-size: 12px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        border-left: 1px solid #c3c3c3;
        color: gray;
      }

    }

    .yf {
      font-size: 12px;
      color: gray;
      margin: 10px 0;
    }
  }

  .goods-detail-container {
    // 给页面外层的容器，添加 50px 的内padding，
    // 防止页面内容被底部的商品导航组件遮盖
    padding-bottom: 50px;
  }

  .goods_nav {
    // 为商品导航组件添加固定定位
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
  }
</style>